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emmainna [20.7K]
3 years ago
12

An isosceles triangle has two sides of equal length. The third side is 5 less than twice the length of one of the other sides. I

f the perimeter of the triangle is 23 cm, what is the length of the third side?
Explain how you would define a variable for this problem.

Mathematics
2 answers:
Svetradugi [14.3K]3 years ago
7 0
Let's take one side of the two equal lengths as r
third side is s.
so the total perimeter is r + r + s
2r + s = 23

According to the statement of third side s, 
5 less than twice the length of one of other
s = 2r - 5

we have 2 equations and 2 unknowns. so we can find out the values of those letters.

2r + s = 23
2r - s = 5

4r = 28
r = 7

s = 9
Therefore the third length will be equal to 9 cm.


fredd [130]3 years ago
6 0

Answer:

See below.

Step-by-step explanation:

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